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Test NTC-45: Throttle Position (TP) Sensor Circuit

  1. Turn ignition on. Using scan tool, read TP sensor voltage (sensor read test No. 07). With throttle closed, voltage should be 400 millivolts or more. With throttle fully open, voltage should be 3800 millivolts or less. If voltage is not as specified, go to next step. If voltage is as specified, no problem is indicated at this time. Failure may be intermittent. See INTERMITTENT MALFUNCTION .
  2. Turn ignition off. Disconnect TP sensor harness connector. Measure resistance between terminals No. 1 (Black/Green wire) and No. 3 (Green/Yellow wire) at TP sensor (component side). Resistance should be 3.5-6.5 k/ohms. Measure resistance between terminals No. 2 (Brown/Red wire) and No. 3 (Green/Yellow wire) at TP sensor (component side). Resistance should increase smoothly as throttle is opened. If both resistances are as specified, go to next step. If either resistance is not as specified, replace TP sensor.
  3. Turn ignition on. Measure voltage between ground and terminal No. 3 (Green/Yellow wire) at TP sensor harness connector. Voltage should be 4.8-5.2 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  7.
  4. Check for continuity between ground and Black/Green wire at TP sensor harness connector. If continuity exists, go to next step. If continuity does not exist, check for open in Black/Green wire between TP sensor and terminal No. 43 at PCM harness connector A-78. Circuit runs through junction connector No. 3. See WIRING DIAGRAMS article. Repair wiring as necessary.
  5. Check PCM connectors, junction connector No. 4 and TP sensor connector for damaged wires or terminals. PCM is located at left front corner of engine compartment, in front of Electronic Automatic Transmission Electronic Control Module (EATX-ECM), near relay box. Junction connector No. 4 is located under relay box in left front corner of engine compartment. See Figure. Repair connectors as necessary. If connectors are okay, go to next step.
  6. Check wiring between PCM and TP sensor. See WIRING DIAGRAMS article. Repair wiring as necessary. If wiring is okay, test is complete.
  7. Check PCM connectors and junction connector No. 4 for damaged wires or terminals. PCM is located at left front corner of engine compartment, in front of Electronic Automatic Transmission Electronic Control Module (EATX-ECM), near relay box. Junction connector No. 4 is located under relay box in left front corner of engine compartment. See Figure. Repair connectors as necessary. If connectors are okay, go to next step.
  8. Check wiring between PCM and TP sensor. See WIRING DIAGRAMS article. Repair wiring as necessary. If wiring is okay, replace PCM.
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